Physics

Friction

8. The object of mass 2 kg, which is standing on the horizontal path where the coefficient of friction is k = 0.4, is pushed by a force of 20 N as in the figure. F=20 N horizontal k= 0.4 The force is removed after 8 seconds of application. According to this, how many meters does the object travel from the beginning until it stops? (g = 10 m/s2) A) 308 B) 336 C) 352 D) 420 E) 480

A 63-kg diver jumps off a 11.7-m diving board into the water below. Once he enters the water, he comes to a complete stop 3.1 m below the surface. Find the force exerted on the diver by the water. HINT: If you find how fast the diver's moving when he hits the water, you can calculate his acceleration in the water...

1 1 1 1 1 1 11 12 1 1 1 1 1 1 3 1 4 1 1 1 5 1 6 1 7 FRICTION on a RAMP: Work the 3 problems given. (504 students may choose one to fulfill points) 1. A 30 kg mass on a 40 degree ramp is just on the edge of moving. What is the friction force keeping it from moving? Assume that the coefficient of friction Between the mass and ramp is 0.15. I

Save QUESTION 3 10 points A bar keeper slides a glass across the bar counter to a customer by giving the glass an initial speed of 2 m/s. The coefficient of kinetic friction between the glass and the table is 0.1. The customer is 2 m away. Will the glass reach the customer? Attach File Browse My Computer Browse Content Collection Browse Dropbox

7. For a rubber block that has a mass of 19 kg, what is the difference in force, to just start to move it, between the block on dry and wet concrete. You will have to calculate both frictional forces for the same block mass and then find the Difference

The coefficient of static friction between a book and a desk is 0.3 and the coefficient of kinetic friction is 0.25. If the book has a mass of 1.25 kg, how much force does it take to get the book moving? How much friction is applied to the book once it starts moving?

4. Determining Friction 20 pts possible part 1 of 2 Previous responses A block weighing 5 N requires a force of 3.9 N to push it along at constant ocity What is the coefficient of friction for the surface? ✓ 1. 0.78 (11/13/21 7:06 PM) part 2 of 2 SUBMIT ANSWER Your response... A weight W is now placed on the block and 4.4 N is needed to push them both at constant velocity. What is the weight W of the block? Answer in units of N. Previous responses X 1.0 (11/13/21 7:06 PM) 4 of 5 5 | 4* | 1 | 3* | 2* * indicates slides with an unanswered question. Please ensure you answered all pa question. 11

1. Friction on a Crate 10 pts possible A horizontal force of 100 N is used to pull a crate, which weighs 500 N, at constant veloc- ity across a horizontal floor. What is the coefficient of kinetic friction? 1. 0.5 02. 20 3. 0.2 O 4. 2 . 5. 0.05

below the horizontal, as shown figure a. belA 100 kg crate is being pushed across a level floor at a constant speed by a force = 300 N at an angle of 20.00 7 20.0" 20.0°7 6 a) What is the coefficient of kinetic friction between the crate and the floor? b) If the 3.00 N force is instead pulling the block at an angle of 20.0° above the horizontal, as shown in figure b, what will be the acceleration of the crate? Assume that the coefficient of friction is the same as that found in a 8. A wooden block is placed on an inclined plane and given a push to start it in motion. The coefficient of sliding friction is.30. What angle will allow the block to slide down the incline at constant speed?

A 10-kg object starts from rest from the top of 2-meter-tall ramp that is inclined at 40° above the x axis. It slides along the rough surface of the incline with the coefficient of kinetic friction 0.20. Using Energy conservation a) Find the speed of the object at point B. Then it continues to move along a rough horizontal surface until coming to rest at point C. b) Find the coefficient of kinetic friction for the horizontal surface between B and C if the object stops at C after moving 5 m. A B C

A4-kg object is moved along a rough surface inclined at 15° downward at a constant speed as the result of the applied horizontal force. The coefficient of kinetic friction between the surface and the object is 0.25. Find a) the magnitude of the applied force. F b) What is the magnitude of the applied force F for the object to move up with acceleration 2 m/s^2. BA

The collar bearing uniformly supports an axial force of P = 8.5 kN. The coefficient of static friction is He=0.3. (Figure 1) Part A Figure 1 of 1 Determine the smallest torque M required to overcome friction Express your answer to three significant figures and include the appropriate units. line HA ? abus M= Value Units urvey Submit Request Answer 150 mm Provide Feedback Nax

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